Star-Delta Starter
It looks like you're asking about a Star-Delta Starter. This is a type of motor starter used to reduce the starting current of induction motors. It is commonly used in three-phase motors to avoid high inrush currents that can damage electrical components or cause voltage drops.
Working Principle:
1. Starting in Star Connection: The motor initially
starts with a star (Y) connection, reducing the voltage to 1/3 (about 58%) of the line voltage. This reduces the starting current and torque.
2. Switching to Delta Connection: After a set time
(using a timer or relay), the connection shifts to delta (Δ), where the motor receives full line voltage and operates at full power.
Advantages:
Reduces starting current (typically 1/3 of direct online starting).
Minimizes voltage drops in the system.
Suitable for large motors (typically above 5 HP).
Disadvantages:
Reduces starting torque (1/3 of full torque).
Requires more components (contactors, timer, and relays).
Not suitable for heavy-load startups.
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